What is the ground speed of a jump aircraft with an airspeed of 90 knots against a 50-knot headwind?

To determine the ground speed of an aircraft, you need to account for both its airspeed and the effects of wind. In this scenario, the jump aircraft has an airspeed of 90 knots and is flying into a headwind of 50 knots. Ground speed is calculated by adjusting the airspeed for the wind conditions.

In this case, because there is a headwind, you subtract the wind speed from the airspeed. Therefore, the calculation would be:

Ground Speed = Airspeed - Headwind

Plugging in the numbers:

Ground Speed = 90 knots - 50 knots = 40 knots

Thus, the ground speed of the jump aircraft is 40 knots. This value accurately reflects how fast the aircraft is moving over the ground, factoring in the opposing wind. Recognizing the impact of headwinds on the performance and landing of an aircraft is crucial for both safety and operational efficiency in parachuting activities.